[*] BO : Correct Request Sql Manager validate options

Correct Request Sql Manager validate options :
- No size limit for the request
- cutJoin() doesn't work for multiple Join (exemple : LEFT JOIN `XXX ON XXX AND XXX) => Then you can't save the request, even if it work
Merge pull request #519 from axometeam/patch-5

[*] BO : Correct Request Sql Manager validate options